I'm working on a black hole that I picked up in non working condition.
Looks to have set for a very long time.
I did all ground mods to all the board's and a new power cord. I removed the battery and corrosion damaged parts from the mpu and cleaned the board and repopulated the components.
The game boots, I can play, sounds and speech are functioning.
I am having a problem with the battery backup. I have this same problem with and without battery connected.
I've got "8" credits all the time and the high score is "888888".
Is this a possible 5101 fault?
Any info would be great!